can you provide a link to your previous posting of this please. I'm no expert on creamers but with my limited experience, wheel engraving (which is what this appears to be) on a pressed creamer seems unusual. I assume your fluorescence is green, and is almost certainly caused by the presence of manganese oxide, which was added to the glass batch (when producing clear glass) as a decolourizer to counteract unwanted brown or greenish discolouration caused by iron impurities in the silica). Apparently, the manganese functions as a chromatic neutralizer. Presumably this piece doesn't carry any marks or Nos., and unless someone recognizes this particular pattern, you will remain forever without an attribution. These objects were made (in glass) excessively commonly every where from before the middle of the C19 until the middle of the C20, and although you don't mention wear, it might be a general rule of thumb that the greater the wear the greater the age - but that is only a very general guide. It very much depends on whether the creamer has spent its life on a table cloth or some far rougher surface - used heavily - or spent its life in a cupboard.

Ref. 'An Illustrated Dictionary of Glass' - Harold Newman - Thames and Hudson - 1977.